U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8656467 PUBLICATION DATE: 12/20/2012
Name: SPOONERS CREEK
NC
NOAA Chart: 11541 Latitude: 34° 43.5' N ( 34.72500)
USGS Quad: MANSFIELD Longitude: 76° 48.2' W ( -76.80330)
To reach the tidal bench marks from Beaufort-Morehead City airport in Morehead
City North Carolina, proceed SE on Airport Rd for 0.3 km (0.2 mi) to the
intersection with Highway 101, turn right and proceed SSE for 1.0 km (0.6 mi) to
the intersection of Highway 101 and Highway 70, keep right and merge onto
Highway 70 (Live Oak Street) proceeding SW for 1.1 km (0.7 mi) to the
intersection with Cedar Street, turn right and proceed westerly on Highway 70
(Cedar Street) for 13.0 km (8.1 mi) to the intersection of Highway 70 and
Highway 24, turn left and proceed west on Highway 24 for 1.3 km (0.8 mi) to
Harbor Drive, turn left and proceed south on Harbor Drive 0.8 km (0.5 mi) to its
termination at Lands End Road, turn left and proceed east along Lands End Road
for 0.2 km (0.1 mi) to the cul-de-sac and gated entrance to the Marina. The
bench marks are located along Lands End Road and the waterfront area. The tide
gauge is located at the end of the cul-de-sac of Lands End Road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6467 A 2012
DESIGNATION: 865 6467 A
MONUMENTATION: Survey disk VM#: 20405
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 34° 43.5' N ( 34.72583) LONGITUDE: 76° 48.2' W ( -76.80381)
The primary bench mark is a disk set in the top of a concrete seawall, 56.65 m
(185.9 ft) west-northwest of the eastern end of the seawall, 28.4 m (93.2 ft)
east-northeast of the east side of a stairway, 10.18 m (33.4 ft) east-southeast
of the northeast corner of a wooden utility shed, 1.62 m (5.3 ft)
north-northeast of the brick retaining wall, 1.25 m (4.1 ft) west-northwest of a
metal dock cleat and 0.33 m (1.1 ft) south-southwest of the fifth wooden piling
from the channel.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8656467 PUBLICATION DATE: 12/20/2012
Name: SPOONERS CREEK
NC
NOAA Chart: 11541 Latitude: 34° 43.5' N ( 34.72500)
USGS Quad: MANSFIELD Longitude: 76° 48.2' W ( -76.80330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6467 B 2012
DESIGNATION: 865 6467 B
MONUMENTATION: Survey disk VM#: 20406
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBCS30
LATITUDE: 34° 43.5' N ( 34.72561) LONGITUDE: 76° 48.2' W ( -76.80322)
The bench mark is a disk set in the top of a concrete seawall on the westside of
the entrance to Spooner's Creek Marina, 50.85 m (166.8 ft) east-southeast of the
top back curb on the east side of the cul-de-sac, 35.40 m (116.1 ft) southeast
of the eastern most wood piling, 31.52 m (103.4 ft) north of the southern corner
of the seawall, 12.88 m (42.3 ft) southeast of the eastern end of the brick
retaining wall and 5.74 m (18.8 ft) south of the northern corner of the seawall.
BENCH MARK STAMPING: 6467 C 2012
DESIGNATION: 865 6467 C
MONUMENTATION: Survey disk VM#: 20407
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 34° 43.5' N ( 34.72578) LONGITUDE: 76° 48.4' W ( -76.80608)
The bench mark is a disk set in the southwest corner of the concrete pad for a
green utility box on the north side of Lands End road, 9.87 m (32.4 ft)
west-northwest of a light pole, 6.90 m (22.6 ft) southwest of an entrance to a
ground floor parking garage beneath a building, 6.68 m (21.9 ft) north of the
top back of curb of the road, 3.36 m (11.0 ft) west-northwest of the southwest
corner of a concrete pad for an air conditioning unit, 0.22 m (0.7 ft) southwest
of the southwest corner of the utility box and 0.16 m (0.5 ft) north-northeast
of the southwest corner of the concrete pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8656467 PUBLICATION DATE: 12/20/2012
Name: SPOONERS CREEK
NC
NOAA Chart: 11541 Latitude: 34° 43.5' N ( 34.72500)
USGS Quad: MANSFIELD Longitude: 76° 48.2' W ( -76.80330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6467 D 2012
DESIGNATION: 865 6467 D
MONUMENTATION: Survey disk VM#: 20408
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 34° 43.6' N ( 34.72642) LONGITUDE: 76° 48.4' W ( -76.80625)
The bench mark is a disk set in the west end of the southern bridge abutment
north of the Spooner's Creek Marina office and underneath a paver stone, 17.50 m
(57.4 ft) south-southeast of a manhole cover, 16.43 m (53.9 ft) east of the gate
to the swimming pool, 13.68 m (44.9 ft) west-southwest of the boardwalk on top
of the seawall, 10.80 m (35.4 ft) southeast of a light pole, 5.33 m (17.5 ft)
northeast of the northeast corner of the marina office building and 0.10 m (0.3
ft) below grade.
BENCH MARK STAMPING: 6467 E 2012
DESIGNATION: 865 6467 E
MONUMENTATION: Survey disk VM#: 20409
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 34° 43.6' N ( 34.72667) LONGITUDE: 76° 48.4' W ( -76.80692)
The bench mark is set in the top of a concrete seawall at the north end of
Spooner's Creek Marina, 22.4 m (73.5 ft) northeast of an old oak tree, 9.38 m
(30.8 ft) northwest of the northwest corner of the concrete pad for a green
utility box, 3.55 m (11.6 ft) east of the east end of a brick retaining wall,
2.96 m (9.7 ft) west-northwest of a corner in the seawall and 0.34 m (1.1 ft)
south of the north edge of the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8656467 PUBLICATION DATE: 12/20/2012
Name: SPOONERS CREEK
NC
NOAA Chart: 11541 Latitude: 34° 43.5' N ( 34.72500)
USGS Quad: MANSFIELD Longitude: 76° 48.2' W ( -76.80330)
T I D A L D A T U M S
Tidal datums at SPOONERS CREEK based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: April 2012 - July 2012
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8656483 BEAUFORT, DUKE MARINE LAB
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.596
MEAN HIGH WATER MHW = 0.534
MEAN SEA LEVEL MSL = 0.300
MEAN TIDE LEVEL MTL = 0.286
MEAN LOW WATER MLW = 0.038
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6467 A 2012 2.838 2.304
6467 B 2012 2.848 2.314
6467 C 2012 4.092 3.558
6467 D 2012 3.520 2.986
6467 E 2012 3.420 2.886
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8656467 PUBLICATION DATE: 12/20/2012
Name: SPOONERS CREEK
NC
NOAA Chart: 11541 Latitude: 34° 43.5' N ( 34.72500)
USGS Quad: MANSFIELD Longitude: 76° 48.2' W ( -76.80330)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.